US7503920B2 - Spinal surgery system and method - Google Patents
Spinal surgery system and method Download PDFInfo
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- US7503920B2 US7503920B2 US11/028,655 US2865505A US7503920B2 US 7503920 B2 US7503920 B2 US 7503920B2 US 2865505 A US2865505 A US 2865505A US 7503920 B2 US7503920 B2 US 7503920B2
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Definitions
- the present invention relates to spinal surgery and, in particular, it concerns a system and method for performing various minimally invasive spinal surgical procedures.
- MISS minimally invasive spinal surgery
- the present invention is an apparatus and method for minimally invasive spinal surgery, and corresponding surgical techniques which can advantageously be implemented using the apparatus and method of the invention.
- the invention also relates to a tunneling system and corresponding method for forming an arcuate tunnel through tissue.
- a tunneling system for forming an arcuate tunnel through biological tissue, the tunneling system comprising: (a) a delivery conduit having an inner channel and an open end, at least part of the inner channel being substantially straight; and (b) a tunneling device for deploying within the inner channel and advancing beyond the open end, at least a distal portion of the tunneling device being formed from a series of substantially rigid elements interconnected at pivotal interconnection regions having parallel effective hinge axes, the interconnection regions being configured to transfer compressive forces between adjacent of the elements, each of the elements further including at least one contact surface disposed for abutting a corresponding region of an adjacent one of the elements so as to define a maximum deflection of relative pivotal motion between adjacent of the elements, such that, when the distal portion is deployed within the inner channel, at least part of the distal portion assumes a substantially straight state with the contact surfaces and the corresponding regions separated and, as the distal portion is advanced beyond the open end into the biological tissue, the elements are
- the tunneling device is integrally formed as an elongated body with a plurality of transverse slots spaced along its length, regions between adjacent of the slots providing the substantially rigid elements and regions around the slots providing the pivotal interconnection regions.
- the elongated body is formed from metallic material.
- the elongated body is hollow.
- At least a distal tip of the elongated body is non-hollow.
- the elongated body has a substantially rectangular cross-sectional outline.
- the transverse slots are substantially V-shaped.
- the transverse slots are substantially parallel-sided.
- each of the elements includes at least two of the contact surfaces and a corresponding two abutment regions, the at least two contact surfaces being non-coplanar.
- the tunneling device terminates in a distal tip having a bevel angle inclined so as to tend to deflect the elements towards the arcuate state when advanced.
- the bevel angle is inclined between 20° and 70° to a longitudinal axis of the tunneling device when in the substantially straight state.
- a drive device associated with the delivery conduit and with the tunneling device, the drive device being configured to advance the tunneling device relative to the delivery conduit.
- the tunneling device features a series of recesses, the drive device having at least one projecting feature for engaging at least one of the recesses.
- the tunneling device further includes a tensioning element deployed along at least part of a length of the tunneling device for biasing adjacent of the elements to the maximum deflection.
- an apparatus for use in performing a minimally invasive spinal surgical procedure via a pair of bilateral stab wounds on either side of a subject region of the spine of a patient comprising: (a) a first hollow rigid tube having a proximal end and a distal end, the distal end for insertion through a first of the stab wounds; (b) a second hollow rigid tube having a proximal end and a distal end, the distal end for insertion through a second stab wound in the back of a patient; (c) a rigid coupling for rigidly coupling the first and second tubes such that the tubes converge towards the distal ends but maintain a predefined gap between the distal ends; and (d) a tunneling system deployable along the first tube for forming an arcuate tunnel so as to traverse the gap between the distal ends of the first and second tubes, the tunneling system including a tunneling device, at least a distal portion of the tunneling device
- an elongated flexible guide element for deployment, after removal of the tunneling system, so as to extend through the first hollow tube from the proximal end to the distal end, to traverse the gap and to extend through the second hollow tube from the distal end to the proximal end.
- the first and second tubes are implemented as substantially straight hollow tubes.
- the distal ends of the first and second tubes are implemented as inward-facing beveled ends.
- the distal ends of the first and second tubes are curved towards the gap.
- a removable trocar removably receivable within each of the first and second tubes for facilitating insertion of the first and second tubes in the back of the patient.
- FIG. 1 is a plan view of a vertebra illustrating schematically a surgical apparatus and method, constructed and operative according to the teachings of the present invention
- FIG. 2 is a schematic isometric view of the apparatus of FIG. 1 ;
- FIG. 3A is an enlarged side view of a first preferred configuration for the distal end of rigid tubes for use in the apparatus of FIG. 1 ;
- FIG. 3B is an enlarged side view of the distal end of the tube of FIG. 3A showing a trocar inserted within the tube for penetration of tissue;
- FIG. 3C is a side view of an alternative configuration for a distal end of rigid tubes for use in the apparatus of FIG. 1 ;
- FIG. 3D is an enlarged side view showing a directional drilling device extending from the distal tube end of FIG. 3A ;
- FIG. 4 is a schematic side view illustrating the use of the apparatus of FIG. 1 employed to perform a procedure on an intervertebral disc;
- FIG. 5 is a schematic plan view of a preferred net element for use in the procedure of FIG. 3 ;
- FIG. 6 is a schematic cross-sectional view showing a preferred mode of releasable connection of beads with a flexible guide element for use in the procedure of FIG. 3 ;
- FIG. 7 is a schematic plan view illustrating the release of a chain of beads into the net element of FIG. 4 during performance of the procedure of FIG. 3 ;
- FIGS. 8A and 8B are schematic plan views illustrating a directional tissue compression device for use in a procedure on a vertebral body according to the teachings of the present invention, the device being shown prior to and during use, respectively;
- FIG. 9 is a schematic plan view of a directionally inflating perforated expandably fillable element, constructed and operative according to the teachings of the present invention, for use in a vertebral body subsequent to said direction tissue compression device;
- FIGS. 10A and 10B are schematic side views of a tunneling system, constructed and operative according to a further aspect of the present invention, shown prior to and during formation of an arcuate tunnel, respectively;
- FIG. 10C is an enlarged view of a portion of a tunneling device from the tunneling system of FIG. 10A ;
- FIGS. 11A and 11B are top and side views, respectively, of a tunneling device suitable for use in the tunneling system of FIGS. 10A and 10B in a substantially straight state;
- FIG. 11C is a view similar to FIG. 11B showing the tunneling device in an arcuate state
- FIG. 11D is an enlarged cross-sectional view of a small region of FIG. 11B ;
- FIG. 11E is an enlarged view of a small region of FIG. 11A ;
- FIG. 12A is a schematic isometric view of an alternative implementation of the tunneling device of FIGS. 10A and 10B in a substantially straight state;
- FIG. 12B is a side view of the device of FIG. 12A in an arcuate state
- FIGS. 13A and 13B are schematic isometric views of a further alternative implementation of the tunneling device of FIGS. 10A and 10B in a substantially straight state, showing non-hollow and hollow implementations, respectively;
- FIG. 14 is a schematic illustration of the tunneling system of FIGS. 10A and 10B for use in the apparatus of FIGS. 1-9 and including a drive device for advancing the tunneling device;
- FIG. 15 is a schematic isometric view of a non-hollow implementation of the tunneling device of FIGS. 10A and 10B .
- the present invention is an apparatus and method for minimally invasive spinal surgery.
- the invention also provides surgical techniques, advantageously implemented using the apparatus and method of the invention, for intervertebral disc repair and for vertebral body repair.
- FIG. 1 illustrates a preferred apparatus and corresponding method for performing various minimally invasive spinal surgery (MISS) procedures according to the teachings of the present invention.
- the preferred surgical method of the present invention is based on inserting an elongated flexible guide element 10 such that the guide element passes in through a first lateral posterior incision, passes through the spinal column anterior to the spinal cord, and passes out through a second lateral posterior incision contralateral to the first incision.
- the guide element 10 is then employed to guide at least one element to a desired position within the spinal column as part of the surgical procedure.
- the guide element thus placed functions in a manner analogous to the ubiquitous guide wire of vascular surgery, defining a precise path along which other elements or devices can be advanced in a precise and repeatable manner.
- the device effectively provides a platform for manipulation of tissues and introduction of implants anterior to the spinal cord.
- the elements or devices may travel along using the guide element as a stationary rail, or the guide element itself may be advanced through the spinal column with pull-through functionality.
- the guide element provides a well defined reference location within the spinal column for performance of a MISS procedure.
- the guide element also facilitates bilateral fixation at the end of the procedure by attachment of portions of the guide element to bone surfaces on both sides of the vertebra.
- the path of guide element 10 through the spinal column is preferably defined by a pair of hollow rigid tubes 12 , 14 inserted through contra-lateral incisions in the back of a subject.
- the soft tissue through which the incisions are made has been omitted from the drawings.
- Suitable incisions for such a lateral posterior approach are well known, and can typically be implemented as a small stab wound.
- a rigid coupling 16 is configured for rigidly coupling tubes 12 , 14 such that the tubes converge towards their distal (inserted) ends but maintain a predefined gap between their ends. This gap is preferably in the range of 15-20 millimeters wide.
- Guide element 10 is then deployed passing in through a first of the hollow tubes 12 , traversing the gap between the distal ends, and passing out through a second of the hollow tubes 14 .
- the portion of the guide element traversing the gap defines a working region within the spinal column, as will become clearer from the subsequent examples.
- FIG. 2 illustrates in more detail a preferred implementation of the apparatus.
- first and second tubes 12 , 14 are preferably implemented as substantially straight hollow tubes with inward-facing distal openings such that the distal openings face each other across the gap. This facilitates insertion of guide element 10 passing across the gap and helps to clearly delimit the sides of the gap.
- the distal ends of tubes 12 , 14 are implemented as inward facing beveled ends.
- the distal ends of first and second tubes 12 , 14 are curved towards the gap as illustrated in FIG. 3C .
- each tube 12 , 14 has an enlarged clamping portion 12 a, 14 a with a flat surface 18 defining a clamping orientation relative to rigid coupling 16 .
- Clamping portions 12 a and 14 a are preferably also asymmetric under reflection so as to be non-interchangeable with each other.
- each clamping portion has a generally triangular asymmetric cross-section where only one side is flat to provide clamping surface 18 and the remainder of the surfaces are curved.
- rigid coupling 16 is implemented with eccentric lever clamps 20 deployed in slots 22 .
- This allows quick clamping in a range of relative spacings between the rigid tubes, but in a predefined angular relation defined by clamping surfaces of clamps 20 .
- the angular relation is typically inclined inwards towards a central plane through the device at between 15°-25°, corresponding to an angle of conversion of the two tubes in the range of 30°-50°.
- many other clamping configurations may equally be used, optionally giving additional degrees of freedom of adjustment such as an angular adjustment of the rigid tubes.
- rigid coupling 16 may be mechanically linked through an adjustable clamping structure (not shown) to a fixed reference surface such as an operating table to provide additional stabilization and rigidity during performance of a procedure.
- the rigid coupling may be temporarily anchored to the subject's body via axial skeletal features. Suitable adjustable clamping structures for both of these types of clamping are known in the art and will not be described herein.
- a wide range of materials may be used to produce rigid tubes 12 , 14 and rigid coupling 16 .
- Particularly preferred examples include, but are not limited to, surgical steel and other biocompatible metals, metal alloys and rigid polymers.
- the diameter of the tubes is typically in the range of 2-6 mm, and most preferably in the range of 3-5 mm.
- a removable trocar 24 is removably received within each tube 12 , 14 ( FIG. 3B ) to facilitate insertion of the first and second tubes through soft tissues of the subject's back to reach the desired position. The trocar is then withdrawn to free the lumen of the tube for insertion of the guide element.
- the apparatus and method of the present invention are useful for performance of a wide range of MISS procedures, including many known procedures conventionally performed by other surgical techniques. These include procedures performed both on intervertebral discs and on the vertebral body.
- rigid tubes 12 , 14 are preferably inserted immediately above the transverse processes of the vertebra below the disc in question as shown in FIG. 4 .
- preferred positioning for insertion of rigid tubes 12 , 14 is via small holes drilled through the pedicle on each side of the vertebra.
- the apparatus preferably also includes a retractable tunneling or drilling system. A particularly preferred implementation of a tunneling system constructed and operative according to the teachings of the present invention will be described below with reference to FIGS. 10A-15 .
- a conventional drilling device such as drilling device 26 ( FIG. 3D ), removably associated with one of tubes 12 , 14 so as to drill a connecting channel through the gap for insertion of the guide element.
- retractable drilling device 26 is preferably implemented as a directional drilling device configured for drilling in a direction non-parallel with a central bore of the tube.
- thermal or laser ablation may be used for this purpose, mechanical drills are believed to be preferable to avoid risk of thermal damage to surrounding tissue (disc, bone and nerves).
- suitable mechanical directional drilling devices both steerable and with a fixed lateral curvature, are known in the field and will not be described herein in detail.
- two suitable designs are described in U.S. Pat. No. 6,558,386 which is hereby incorporated by reference, particularly with reference to FIGS. 9-10 thereof.
- guide element 10 itself, it should be noted that the guide element may be implemented in many different configurations varying in shape, gauge, materials and deployment according to the requirements of each given procedure to be performed. Furthermore, various different guide element configurations may be used during the course of a single procedure, either by withdrawing a first guide element and deploying an alternative guide element or by connecting different guide element configurations sequentially such that each section pulled out draws the subsequent section of the guide element into position traversing the gap within the spinal column as required.
- the guide element is preferably chosen to be asymmetric under rotations of less than 180° about its length, thereby providing a defined orientation for devices introduced within the spinal column.
- a simple example of a preferred asymmetric form is a flat strip. Other examples will be discussed below in the context of certain specific applications.
- Preferred materials for the guide element are typically flexible biocompatible polymer materials such as PEEK or resilient metals or metal alloys such as spring steel or superelastic nitinol alloys.
- FIGS. 5-7 a preferred technique for repair of a damaged intervertebral disc will now be described. It should be appreciated that, while the technique is described in a particularly preferred context implemented using the surgical method of the present invention, various aspects of the technique are believed to be patentable in their own right even if implemented using otherwise conventional surgical methods.
- the disc repair technique of the present invention is performed by introducing into the nucleus of a damaged disc a plurality of beads of material chosen to have surface properties which encourage generation of scar tissue.
- the filling conforms readily to the geometry of the load-transfer surfaces of adjacent vertebrae and immediate provides load-bearing support in a manner similar to that described in U.S. Pat. No. 5,702,454.
- the use of surfaces for encouraging generation of scar tissue initiates a physiological process in which scar tissue fills the gaps between the beads, becoming a significant if not primary contributor to the physical properties of the disc nucleus.
- Scar tissue being highly fibrous, moderately flexible and having few nerves has been found by the present inventor to be an ideal substitute for the natural tissue of the inner disc.
- the beads are preferably formed primarily, or entirely, from material exhibiting surface pores of width 50-100 microns, and most preferably in the 70-80 micron range.
- a preferred but non-limiting example of a biocompatible material exhibiting pores of this size is polypropylene.
- the beads are preferably rounded to ensure that they conform readily to the shape of the space to be filled.
- substantially spherical beads are used.
- a preferred diameter (or maximum dimension for non-spherical beads) is typically in the range of 1-10 mm, and most preferably around 1-5 mm.
- this aspect of the present invention preferably employs a net element configured to contain the plurality of beads within a defined containment region.
- the net element must clearly have openings sufficiently fine to prevent passage of the filling beads.
- the openings of the net element are sufficiently large to permit penetration of tissue cells and small blood vessels.
- a preferred range of sizes for the net element openings is up to about 0.5 mm.
- net element 30 is attached to, or integrally formed with, an opening in the side of a piece of flexible tubing such that the portions either side of the net element provide first and second tubular flexible elongated fixation appendages 32 and 34 .
- the functions of these appendages will be described below.
- each bead 36 is formed with a shaped recess and elongated guide element 10 is formed with a complementary sequence of projections or projecting ridge 38 forming a releasable “snap” connection.
- releasable connection configurations may also be used.
- net element 30 is preferably provided with a release configuration deployed to effect release of the beads from guide element 10 .
- the release configuration is implemented as a forked ramp or wedge 40 located within the net element near the point where guide element 10 passes out through appendage 34 .
- beads 36 are interconnected into strings or chains of beads by small interconnecting links.
- the links are integrally molded with the beads.
- the beads may be separately formed and then strung on a separate connecting strand.
- net element 30 is advanced in a folded state around guide element 10 until it reaches a position with the net deployed in the gap between the rigid tubes and appendages 32 and 34 deployed within tubes 12 and 14 , respectively, as shown in FIG. 7 .
- This positioning may be reliably determined by appropriate length markings on parts of appendages 32 and/or 34 extending outwards from the rigid tubes indicating the distance from the beginning of the net element. Additionally, or alternatively, imaging techniques such as fluoroscopy may be used to verify the positioning.
- radio-opaque reference markers are preferably incorporated into the net element at predefined positions.
- the portion of the guide element carrying beads 36 is advanced (typically pulled-through) to draw the beads into the internal volume of the net element. As they reach release configuration 40 , the beads become detached from the guide element, thereby freeing a string of beads as shown in FIG. 7 .
- the deployment of the beads on guide element 10 is such that a predefined length of guide element corresponds to a quantity of beads sufficient to fill a predefined volume. For example, a given length of, for example, 5 cm of the guide element with beads may correspond to a volume of 1 cc.
- the corresponding required quantity of beads may be determined simply by marking-off a required length of the bead-carrying guide element to be used, and possibly severing the beads from the guide element beyond that length.
- FIGS. 8A , 8 B and 9 there is illustrated a preferred apparatus and technique for restoration of a collapsed or damaged vertebral body.
- FIGS. 8A , 8 B and 9 there is illustrated a preferred apparatus and technique for restoration of a collapsed or damaged vertebral body.
- various aspects of the apparatus and technique are believed to be patentable in their own right even if implemented using otherwise conventional surgical methods.
- a directional tissue compression device is introduced into the vertebral body and operated to apply pressure to a transverse slice of tissue within the vertebral body so as to form a cavity anterior to the guide element. Then, once a slice-shaped cavity is formed, an expandably fillable element is introduced into the cavity and inflated with a filling material so as to increase an axial dimension of the vertebral body.
- the technique of the present invention also addresses a further problem of cement leakage common to conventional procedures.
- conventional vertebral body height restoration techniques typically employ an inflatable balloon which is inserted temporarily in order to achieve the desired height restoration. The balloon is then deflated and removed, and PMMA or other cement is injected into the cavity from which the balloon was removed.
- Such techniques suffer from lack of control over the dispersion of the cement which may leak from the vertebral body, or may set with various sharp or abrasive surface features which may subsequently pose a risk of damage to adjacent tissue or blood vessels.
- a permanent filling material such as cement
- the expandably fillable element includes perforations dispersed over its surface such that the introducing a filling material releases a small proportion (typically less than 20%, and most preferably no more than 10%) of the filling material to enhance fixation of the expandably fillable element to the bone of the surrounding vertebral body.
- rigid tubes 12 and 14 are first inserted through respective bores drilled in first and second pedicles, respectively, of the vertebra requiring reconstruction.
- Directional drilling is then typically used to form a channel across the gap between distal ends of the tubes, and guide element 10 is inserted through the vertebral body passing in through the first pedicle of the vertebra, across within the vertebral body and out through the second pedicle of the vertebra.
- FIGS. 8A and 8B illustrate a particularly simple but effective preferred embodiment of the direction tissue compression device, designated 42 .
- Device 42 includes a relatively rigid housing 44 with an arcuate form and having a lateral opening 46 formed near its tip.
- Housing 44 typically has a rectangular cross-sectional shape, although other shapes such as an oval shape are also possible. Some degree of flexibility may be required to allow housing 44 to be inserted along rigid tube 12 . Within housing 44 is deployed a flexible strip.
- the mechanical properties of a flat strip are that it is relatively flexible for in-plane bending but resistant to sideways bending or torsional distortion.
- the flexible strip 48 As a result, as the flexible strip 48 is advanced, confined within housing 44 , it tends to bulge outwards directionally from opening 46 as shown in FIG. 8B , thereby applying pressure directionally to a slice of cancellous bone tissue lying anterior to the device (i.e., forward from the guide element and away from the spinal cord) and bounded by an outer arcuate profile, so as to open a corresponding slice-shaped cavity.
- the term “slice” or “slice-shaped” is used herein in the description and claims to refer to any three-dimensional form bounded in part by two substantially parallel, substantially planar faces, and independent of the shape of the remaining boundaries. In the case of a cavity or void, the bounding surfaces are clearly the inward facing surfaces of the surrounding material.
- the term “height” and “axial” are used to refer to a dimension and direction, respectively, substantially parallel to the spinal cord.
- the term “transverse” is used to refer to a plane substantially perpendicular to the spinal cord.
- both housing 44 and flexible strip 48 may be formed from the same material with the differing degrees of flexibility being provided by suitable design of the dimensions and/or structure of the elements.
- an expandably fillable element is introduced into the cavity.
- a preferred implementation of an expandably fillable element, designated 50 is shown here schematically in FIG. 9 .
- the expandably fillable element expands during filling to initially deploy itself evenly over a large proportion of the lateral dimension of the vertebral body, thereby ensuring that the subsequent continued expansion acts substantially uniformly to increase an axial dimension of the vertebral body.
- expandably fillable element 50 includes a pair of flexible elongated fixation appendages 52 , 54 for providing precise positioning of expandably fillable element 50 prior to inflation and bilateral fixation on completion of the procedure, all in a manner analogous in that of appendages 32 , 34 described above.
- appendages 52 and 54 serves also as a filling conduit for introducing filling material into expandably fillable element 50 .
- a wide range of biocompatible filling materials may be used to inflate expandably fillable element 50 .
- the filling material may be a liquid, a gel, a paste or powdered or granulated solids.
- Preferred examples include, but are not limited to, PMMA and other cements or inert fillers, and/or various material or medicaments used for promoting bone growth or regeneration.
- expandably fillable element 50 includes a plurality of perforations 56 such that a small proportion of the filling material is released from the surface of expandably fillable element 50 during the filling process to enhance fixation of the expandably fillable element in the surrounding tissue.
- the size of the perforations are chosen according to the physical properties of the filling material in order to ensure that only a small proportion is released.
- This fixation enhancement may be an immediate, or nearly immediate mechanical anchoring effect such as in the example of a bone cement filler, or may be part of a slower physiological process such as in the case of a bone regenerating material.
- FIGS. 10A-15 there is illustrated a further aspect of the present invention which provides a tunneling system for forming an arcuate tunnel through biological tissue.
- This system is applicable to a wide range of applications in orthopedic and other types of surgery where it is desired to form an arcuate channel through biological tissue at some point within a human or animal body.
- the system may be used to advantage for forming a channel to bridge the gap between rigid tubes 12 , 14 . While it will be described by way of a non-limiting example in the aforementioned context, it should be appreciated that the system may be adapted, including scaling up or scaling down of dimensions, and adjustment of cross-sectional shape and/or radius of curvature, for use in other contexts.
- the tunneling system includes a delivery conduit 60 having an inner channel 62 and an open end 64 .
- At least part of inner channel 62 is substantially straight, meaning that it is either straight or at least has a radius of curvature significantly greater than that of the arcuate channel to be formed.
- Slidingly deployed within inner channel 62 is a tunneling device 66 .
- at least a distal portion of tunneling device 66 is formed from a series of substantially rigid elements 68 interconnected at pivotal interconnection regions 70 which are configured to transfer compressive forces between adjacent of the elements and provide a series of parallel effective hinge axes.
- Each element 68 also exhibits at least one contact surface 72 disposed for abutting a corresponding region 74 of an adjacent one of elements 68 so as to define a maximum deflection of relative pivotal motion between adjacent of the elements.
- the result of this structure is that, when the distal portion of tunneling device 66 is deployed within inner channel 62 , at least part of the distal portion assumes a substantially straight state ( FIG. 10A ) with contact surfaces 72 and the corresponding regions 74 separated. Then, as the distal portion is advanced beyond open end 64 into the biological tissue, elements 68 are deflected to the maximum deflection so that a part of the distal portion beyond open end 64 assumes a pre-defined substantially arcuate state ( FIG. 10B ).
- the tunneling system of the present invention provides a particularly elegant and effective solution for forming an arcuate tunnel through tissue.
- the substantially straight state of the tunneling device allows it to be inserted along a straight delivery conduit to reach the desired location within the body for starting the arcuate channel.
- resistance of the tissue itself optionally supplemented or replaced by a mechanical biasing arrangement, causes elements 68 to close against each other, thereby forming a mechanically stable arcuate formation which can be driven from the rear by a compressive driving force to forcibly generate an arcuate channel through the tissue.
- the pivotal interconnection regions 70 may be implemented in many different ways.
- the interconnection regions are hinge structures which attach separately formed elements 68 .
- discrete elements 68 are attached along a common flexible backing strip.
- the interconnection regions are integrally formed with elements 68 .
- the structure is preferably integrally formed as an elongated body with a plurality of transverse slots spaced along its length. Regions between adjacent slots thus provide substantially rigid elements 68 and regions around the slots providing the pivotal interconnection regions 70 .
- metal material In the case of metal or metal alloy implementations (referred to generically as “metallic material”), this is typically implemented by machining a length of solid material or a hollow profile to form transverse slots. In the case of polymer materials, the entire structure may be integrally molded or formed by other conventional polymer production techniques.
- parallel effective hinge axes it will be noted that this includes both well defined hinge axes such as that of a hinge-pin structure and a distributed flexion hinge where a relatively thin region of flexible material provides freedom of pivotal movement.
- the effective hinge axis is defined herein as the axis of a hinge-pin structure which would most closely approximate the pivotal freedom of movement provided by the flexion hinge.
- the tunneling device of the present invention has an open-ended hollow elongated body.
- the device operates like an apple-core removing tool, punching out tissue lying in its arcuate path so that the tissue accumulates within the hollow profile of the device.
- the leading edges which circumscribe the end of the opening of the hollow profile may be sharpened to form a cutting edge.
- This configuration is particularly suitable for tunneling through relatively soft tissue, such as for the repair of damaged intervertebral discs as described above with reference to FIGS. 5-7 , although it is also useful for a wide range of other applications.
- At least a distal tip of the tunneling device of the present invention is non-hollow.
- the entire device may be formed from a solid block slotted as described above.
- An example of a non-hollow tunneling device is shown schematically in FIG. 15 .
- This implementation is particularly suited for tunneling through cancellous bone, such as for the restoration of a collapsed or damaged vertebral body as described above with reference to FIGS. 8A , 8 B and 9 , although it is also useful for a wide range of other applications.
- Tunneling device 66 may be implemented in a large number of cross-sectional shapes.
- the elongated body of the device has a substantially rectangular cross-sectional outline, optionally square.
- Alternative cross-sectional shapes include, but are not limited to, triangular, rhomboid, semicircular and otherwise-modified circular.
- the cross-sectional shape preferably has at least one flat side which serves as a base within which (or close to which) the hinge axes lie.
- contact surfaces 72 and corresponding regions 74 may be implemented in many different ways so long as they provide a well defined maximum-deflection abutment position between adjacent elements 68 .
- the contact surfaces and corresponding regions are defined by facing sides of transverse slots which are substantially V-shaped.
- the transverse slots are substantially parallel-sided, having either a rectangular or U-shaped form as viewed from the side ( FIGS. 11B and 11D ).
- contact surfaces 72 and corresponding regions 74 are configured to provide some degree of interlocking, particularly configured to offer resistance against lateral or torsional displacement of adjacent elements 68 .
- each element 68 preferably features at least two non-coplanar contact surfaces 72 and corresponding regions 74 .
- the contact surfaces define an angular ridge and the surfaces of corresponding regions 74 define a complementary trough. This provides a positive interlocking structure in the arcuate state, as indicated by the dashed lines showing overlap in FIG. 12B .
- FIGS. 12A contact surfaces 72 and corresponding regions 74 are configured to provide some degree of interlocking, particularly configured to offer resistance against lateral or torsional displacement of adjacent elements 68 .
- each element 68 preferably features at least two non-coplanar contact surfaces 72 and corresponding regions 74 .
- the contact surfaces define an angular ridge and the surfaces of corresponding regions 74 define a complementary trough. This provides a positive interlocking structure in the arcuate state, as indicated by the
- tunneling device 66 In order to ensure deflection of the tunneling device into its arcuate form as it advances, tunneling device 66 preferably terminates in a distal tip 76 having a bevel angle ⁇ inclined so as to tend to deflect the elements towards its arcuate state when advanced.
- Bevel angle ⁇ defined as the angle between the plane of the beveled end surface and a longitudinal axis of the tunneling device when in the substantially straight state, is preferably between 20° and 70°. This beveled tip ensures that the device reliably assumes its arcuate state as it is advanced into biological tissue due to the resistance of the tissue itself.
- the tunneling device may include a tensioning element (not shown) deployed along at least part of a length of the tunneling device for biasing adjacent of the elements to the maximum deflection.
- a tensioning element deployed along at least part of a length of the tunneling device for biasing adjacent of the elements to the maximum deflection.
- the tensioning element may be implemented as a resilient cable extending along a channel within the tunneling device.
- a substantially non-stretchable cable may be used with manual or other actuation to selectively apply a force to deflect the device.
- the tunneling system of the present invention preferably further includes a drive device configured to advance the tunneling device relative to the delivery conduit.
- a drive device configured to advance the tunneling device relative to the delivery conduit.
- a manually operable drive device 78 configured such that repeated manual operation of a trigger handle causes stepwise advancing of tunneling device 66 relative to conduit 60 .
- drive device 78 operates as a sprocket drive with at least one projecting feature (not shown) for engaging a corresponding series of recesses 80 ( FIGS. 11D and 11E ) formed along at least part of the length of tunneling device 66 .
- conduit 60 may be implemented as hollow rigid tube 12 clamped by rigid coupling 16 .
- the second hollow rigid tube 14 has been omitted here.
Abstract
Description
Claims (20)
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US13/093,883 US8206423B2 (en) | 2004-08-11 | 2011-04-26 | Devices for introduction into a body via a substantially straight conduit to form a predefined curved configuration, and methods employing such devices |
US13/093,889 US8486109B2 (en) | 2004-08-11 | 2011-04-26 | Devices for introduction into a body via a substantially straight conduit to form a predefined curved configuration, and methods employing such devices |
JP2012025498A JP5390646B2 (en) | 2005-01-05 | 2012-02-08 | Device for introducing a predetermined curvilinear structure by being introduced into an object via a substantially straight conduit and method of using this device |
US13/405,306 US8465524B2 (en) | 2004-08-11 | 2012-02-26 | Devices for introduction into a body via a substantially straight conduit to form a predefined curved configuration, and methods employing such devices |
US13/490,483 US8597330B2 (en) | 2004-08-11 | 2012-06-07 | Devices for introduction into a body via a substantially straight conduit to form a predefined curved configuration, and methods employing such devices |
JP2013027094A JP5671080B2 (en) | 2005-01-05 | 2013-02-14 | Device for introducing a predetermined curvilinear structure by being introduced into an object via a substantially straight conduit and method of using this device |
US13/860,545 US8900235B2 (en) | 2004-08-11 | 2013-04-11 | Devices for introduction into a body via a substantially straight conduit to form a predefined curved configuration, and methods employing such devices |
JP2013209658A JP5736431B2 (en) | 2005-01-05 | 2013-10-04 | Device for introducing a predetermined curvilinear structure by being introduced into an object via a substantially straight conduit and method of using this device |
US14/556,295 US20150088139A1 (en) | 2004-08-11 | 2014-12-01 | Devices for introduction into a body via a substantially straight conduit to form a predefined curved configuration, and methods employing such devices |
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US20060036273A1 (en) | 2006-02-16 |
US7918874B2 (en) | 2011-04-05 |
US20080208255A1 (en) | 2008-08-28 |
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